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34results about How to "Reduce DC component" patented technology

Scalable single-stage differential power converter

An embodiment of the invention is a scalable single stage differential power converter. The inverter can be implemented in signal, split and multi-phases. A multiphase converter can be achieved with only three modules. Integrated magnetics used in preferred embodiments of the invention mitigate the DC component of the steady-state dynamics and can be extended to AC ripple mitigation. Control architectures in preferred embodiments can mitigate higher order harmonics in steady state dynamics. Embodiments of the invention also provide scalability for voltage and current source topologies.
Owner:THE BOARD OF TRUSTEES OF THE UNIV OF ILLINOIS

Distributed sensing system based on differential amplification technology

ActiveCN105203136ASolve the problem that the zoom position cannot be adjustedSolve the problem that the accuracy is limited by the range of the data acquisition cardConverting sensor output opticallyData acquisitionSignal light
The invention discloses a distributed sensing system based on the differential amplification technology. The system is composed of an optical path detection part and a circuit demodulation part. In an optical path, two different frequencies of microwave signals are modulated to signal light, the frequency of one path of microwave signals is within the Brillouin frequency-shift frequency, and the frequency of the other path of microwave signals is slightly lower than the Brillouin frequency-shift frequency. and in a circuit, a power divider separates the two paths of signals, the separated two paths of signals are filtered and demodulated respectively, and the demodulated signals are amplified in the differential amplification manner. The signals collected by a data collection card are amplified within the specific amplitude interval by the differential amplification structure, and the problems that the range of the data collection card of a host in the distributed Brillouin time-domain analysis sensing system is limited and that the data collection precision cannot be satisfied and further the measurement accuracy of the system is reduced when the DC component is very large are solved. Devices in the system work stably, the point of temperature or stress change and the temperature or stress value can be accurately measured in multiple times of measurement.
Owner:SOUTHWEST JIAOTONG UNIV

Measuring method of power transmission line failure distance

ActiveCN1793995AReduce DC componentEliminates effects of transition resistanceFault locationCable fault locationEngineering
A method for measuring fault distance of power transmission line measures A phase voltage Uma, current Ima, load current Ifa, zero sequence fault component ImaO, unit positive sequence, zero sequence induction and resistance at M side of fault point then substitutes above values into formula of KL = ( LO ¿C L1 ) L1 and formula of KR = ( RO ¿C R1 ) R 1 for calculating out result.
Owner:保定浪拜迪电气股份有限公司

Micro spherical type short coherent point diffraction interference measurement system and method

The invention provides a micro spherical type short coherent point diffraction interference measurement system and method and belongs to the micro spherical type detection technical field. The micro spherical type short coherent point diffraction interference measurement system and method aims at solving the problems that the contrast ratio of the interference field of the existing short coherent point diffraction interference measurement method is poor and accordingly the measurement accuracy is affected. The micro spherical type short coherent point diffraction interference measurement system comprises a short coherent laser, a first half lambda wave plate, a rectangular reflecting mirror, a polarization splitting prism, a first pyramid prism, a first plane mirror, a second pyramid prism, a PZT (Piezoelectric Ceramic Transducer) phase shifter, a delay platform, a second half lambda wave plate, an optical fiber coupling mirror, a single-mode polarization-maintaining optical fiber, a convergent lens, a pinhole lens, a first collimating lens, a quarter lambda wave plate, a micro-objective, a second plane mirror, a second collimating lens, a polaroid, an area array CCD (Charge Coupled Device) and a computer. According to the micro spherical type short coherent point diffraction interference measurement method, an optical path structure that the quarter lambda wave plate is combined with the polaroid is adopted to select beams in the interference field and accordingly direct current components in the beams are reduced, the contrast ratio of interference fringes is improved, and the adjustable optimization of the contrast ratio is implemented. The micro spherical type short coherent point diffraction interference measurement system and method is applied to the micro spherical type detection.
Owner:HARBIN INST OF TECH

Detection device and detection method for carbon monoxide concentration

The invention discloses a detection device and a detection method for carbon monoxide concentration. In the detection device, a first beam splitter splits a light beam emitted by a light source into acalibration light beam and a detection light beam; the calibration light beam is irradiated to a photoelectric detector after passing through a collimator and a calibrated absorption cell to obtain acalibrated electrical signal; a second beam splitter splits the detection light beam into a reference light beam and a measurement light beam; the reference light beam is irradiated to the photoelectric detector after passing through the collimator to obtain a reference electrical signal; the measurement light beam is emitted from the center of a Fresnel lens after passing through the collimatorand is irradiated to a reflecting end after passing through a to-be-detected area, and the reflecting end reflects the light beam to the photoelectric detector from an original path to obtain a measurement electrical signal; a differential amplifier performs differential operation on the reference electrical signal and the measurement electrical signal to obtain a differential signal; a processordetermines the carbon monoxide concentration in the to-be-detected area according to the calibration electrical signal, the reference electrical signal and the differential signal. The detection device and the detection method disclosed by the invention can improve the detection accuracy of laser spectrum measurement of the carbon monoxide concentration in an open area.
Owner:HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI

Wide-dynamic range pulse blood oxygen measurement system

The invention relates to a wide-dynamic range pulse blood oxygen measurement system, which is mainly technically characterized by comprising a double-beam light-emitting unit, a pre-detection amplification circuit, a direct current elimination circuit, a buffer amplification unit, a central processor module and an output module, wherein the central processor module is connected with the double-beam light-emitting unit, the pre-detection amplification circuit, the direct current elimination circuit, the buffer amplification unit and the output module respectively; the pre-detection amplification circuit, the direct current elimination circuit and the buffer amplification unit are sequentially connected. The system is reasonable in design; two paths of light transmitted through the tail ends of tissues are added to the digital feedback direct current elimination circuit after being sampled, measured and pre-amplified, so that the intensity of photoelectric signals is improved, direct current components in the signals are reduced in a digital feedback way to realize the synchronous amplification of double-beam signals in a wider range and increase the signal to noise ratio, and the dynamic range of signal detection is widened.
Owner:INST OF BIOMEDICAL ENG CHINESE ACAD OF MEDICAL SCI

Reduced stack voltage circuitry for energy storage system diagnostics

Systems and methods to provide a low voltage interface coupleable between an energy storage device or a DC power source (e.g., fuel cell stack, battery) and one or more AC signal diagnostic systems. The low voltage interface reduces a voltage of the DC power source and supplies the reduced voltage to the one or more AC signal diagnostic systems without affecting the results of the measurements obtained by the one or more AC signal diagnostic systems. Such functionality provides a safer method for performing advanced analysis (e.g., EIS, frequency analysis) while utilizing lower cost and / or smaller components.
Owner:BALLARD POWER SYSTEMS +1

Optical semiconductor device

An optical encoder comprises a plurality of first photodiodes, a second photodiode and a circuit. The plurality of first photodiodes are arranged in a first direction, each of the first photodiodes has a light detecting part extending along a direction substantially perpendicular to the first direction. The second photodiode is arranged near tips of the first photodiodes, and has a light detecting part extending along the first direction. The circuit performs a calculation based on outputs of the first and second photodiodes.
Owner:KK TOSHIBA

Excitation power circuit of rotary transformer

The invention discloses an excitation power circuit of a rotary transformer, belongs to the field of drive power sources, and solves the problems of complex circuit and incapability of independently working in the traditional excitation power of the rotary transformer. The excitation power circuit consists of a sinusoidal oscillation circuit, an amplitude adjusting circuit and a power amplifying circuit, wherein the sinusoidal oscillation circuit consists of a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C1, a capacitor C2, a capacitor CSEL1, a capacitor CSEL2, a first operational amplifier and a second operational amplifier; the amplitude adjusting circuit consists of a resistor R6, a resistor R7, a resistor RSEL, a capacitor C3 and a third operational amplifier; and the power amplifying circuit comprises a resistor R8 and a power amplifier. The frequency of a sinusoidal excitation power source generated by the circuit of the invention is modulated by selecting a capacitance value of the capacitor CSEL1 and the capacitor CSEL2, and the amplitude value of the sinusoidal excitation power source is adjusted by changing the resistance value of the resistor RSEL. The excitation power circuit of the invention serves as the drive power source of the rotary transformer.
Owner:HARBIN INST OF TECH

Method for coding high density optical disk modulating code

A method is provided for encoding the modulation code of high-density optical disk. The character is as follow. The run length is 1 to 10 and the code rate is 4 / 6. Add DC control bit in the source data to increase the capacity of controlling direct current component. There are 21 meeting the d-k demand in the 6-figure code letter. 16 code letters are choosed as basic code letters to compose the basic code table, and in 5 code letters left the one whose head and end are both 0 is used as connector. Alternative table is made up of basic code letters and connectors, the length of which is 56. The cascade collision problem of code letters is settled by forward looking encoding. If there is cascade collision between code letters through current and forward looking data modulation, the 2 groups of code letters are replaced by the ones in the alternative table; otherwise, modulate the current data. It has higher capacity and encoding efficiency than DVD. The capacity of single side and double layer is up to 13G. It can meet the demand of high definition video programmes. Furthermore, its direct current component is acceptable; the biggest DSV is 2 times of DVD; the code rate is 33.3% higher than DVD; encoding efficiency is one percentage point higher than DVD.
Owner:HUAZHONG UNIV OF SCI & TECH +1

Method for processing current static deviation of permanent magnet motor

The invention relates to the field of current detecting methods, in particular to a method for processing current static deviation of a permanent magnet motor. The method for processing current static deviation of the permanent magnet motor comprises an initializing step and a current detecting step which are carried out successively, and is characterized in that after current is detected, current static deviation is calculated, and current is sampled during initialization so that i0 is measured; i' is measured when the current is detected; and an actual value of the current is obtained when the current static deviation is calculated. The method has the advantages that required equipment is simple, steps are simple, precision is high, and application range is wide.
Owner:SHANGHAI DAJUN TECH

Short-circuit current providing method and system of grid-connected converter

The invention provides a short-circuit current providing method and system for a grid-connected converter, and the method comprises the steps: M1, when a power grid is short-circuited, setting and calculating a reference power during a fault period of the converter through a power instruction; M2, on the basis of the reference power during the converter fault period, calculating a virtual electromotive force through a self-synchronizing voltage source type control strategy; M3, obtaining a current reference value under the two-phase static coordinate system through calculation based on the virtual electromotive force and the virtual electronic impedance obtained through calculation of the self-synchronizing voltage source type control strategy, obtaining a converter reference voltage signal through a current control inner ring and power grid voltage feedforward control, and obtaining a converter modulation signal through a modulation link; and M4, controlling the output voltage of the converter according to the converter modulation signal, and further controlling the short-circuit current of the grid-connected converter during the power grid fault period. According to the invention, a current loop is embedded in a voltage source type control strategy, and the control strategy does not need to be switched before and after a system fault.
Owner:SHANGHAI JIAO TONG UNIV

Power adjuster for three-phase voltage/power adjustment

The invention discloses a power adjuster for three-phase voltage / power adjustment. The power adjuster comprises a singlechip microcomputer, a phase-locked loop circuit unit, a first current transformation unit, a second current transformation unit, an optical isolation circuit unit, a load control unit and an input signal control unit, wherein the phase-locked loop circuit unit comprises an exclusive-OR gate phase comparator, a voltage-controlled oscillator and a frequency divider; the frequency divider outputs signals to the singlechip microcomputer unit; the first current transformation unit sends voltage input signals obtained from the input signal control unit to the singlechip microcomputer unit; the second current transformation unit sends feedback signals output by the load control unit to the singlechip microcomputer; the optical isolation circuit unit sends synchronous signals generated by a three-phase power supply to the singlechip microcomputer and the load control unit for connection; the load control unit receives width-variable trigger pulses of the optical isolation circuit unit; and the input signal control unit is connected with the first current transformation unit and the singlechip microcomputer. The power adjuster disclosed by the invention has the advantages of reducing the asymmetry of output current, minimizing direct-current components and ensuring that the sensitive load of a transformer is triggered reliably.
Owner:王敉 +1

Direct conversion receiver employing subharmonic frequency translator architecture and related preprocessor

A direct conversion receiver for receiving a first input signal and directly downconverting it to baseband frequencies. The receiver includes a frequency translator which is responsive to a phase-split input signal having 2n components, wherein n is an integer greater than 1. The phase-split signal has a period T which is about n times the period of the first input. The frequency translator alternates, at a rate of about 2n / T, between switching the first input signal to a first output, and switching the first signal to a second output. A preprocessor is available to improve the switching characteristics of the phase-split input signal.
Owner:SKYWORKS SOLUTIONS INC

Microcomputer protection device and signal filtering method of high-voltage motor

The invention discloses a microcomputer protection device of a high-voltage motor. The microcomputer protection device a DSP controller and an upper computer; the input ends of the DSP controller are connected with a power source module, a human-computer communication module, an information transmission module, an analog quantity acquisition module and a switching quantity acquisition circuit; the analog quantity acquisition module comprises a three-phase protection current transformer, a three-phase protection voltage transformer, a zero sequence current transformer and an A / D conversion module; and the output end of the DSP controller is connected with a switching quantity output circuit. The invention also discloses a signal filtering method of a high-voltage motor. The microcomputer protection device of the high-voltage motor of the invention has the advantages of structural simplicity, reasonable design, operational easiness, high practicability, good use results and easiness in popularization, and can assist in avoiding the occurrence of malignant accidents caused by the failure of the high-voltage motor during the normal operation of a power grid. According to the microcomputer protection device of the high-voltage motor, an improved Fourier algorithm is adopted to filter signals received by the DSP controller, so that the accuracy of the signals can be improved, and therefore, the stability and safety of an entire power system can be improved.
Owner:XIAN UNIV OF SCI & TECH

A simple transmission and receiving device and method based on multi-sub band filter groups

The method includes steps: using sub band mapping to map modulation symbols to pointed sub band for transmission; next, through IDFT transform to form signal of multiple sub bands (MSB) in time domain (TD); then, through phase shifting and periodic expand to form signal of MSB with shifted frequency and expanded cycle in TD; carrying out waveform shaping and frequency spectrum shaping signal of MSB in TD; finally; using shifted overlap carries out waveform multiplexing in TD for shaped waveform symbol so as to form transmission symbol. The receiver of the filter set in MSB divides up the received data sequence into multiple data blocks, and each data block is equal to length of prototype filter; and then, carries out operations including waveform matching, phase shafting, DFT etc for the data block so as to obtain data symbol transmitted on pointed sub band. The invention can implement transmitting and receiving signal of multicarrier transmission system based on filter set in MSB.
Owner:SHANGHAI RES CENT FOR WIRELESS TECH

Microsphere type short coherent point diffraction interferometry system and measurement method

The invention provides a micro spherical type short coherent point diffraction interference measurement system and method and belongs to the micro spherical type detection technical field. The micro spherical type short coherent point diffraction interference measurement system and method aims at solving the problems that the contrast ratio of the interference field of the existing short coherent point diffraction interference measurement method is poor and accordingly the measurement accuracy is affected. The micro spherical type short coherent point diffraction interference measurement system comprises a short coherent laser, a first half lambda wave plate, a rectangular reflecting mirror, a polarization splitting prism, a first pyramid prism, a first plane mirror, a second pyramid prism, a PZT (Piezoelectric Ceramic Transducer) phase shifter, a delay platform, a second half lambda wave plate, an optical fiber coupling mirror, a single-mode polarization-maintaining optical fiber, a convergent lens, a pinhole lens, a first collimating lens, a quarter lambda wave plate, a micro-objective, a second plane mirror, a second collimating lens, a polaroid, an area array CCD (Charge Coupled Device) and a computer. According to the micro spherical type short coherent point diffraction interference measurement method, an optical path structure that the quarter lambda wave plate is combined with the polaroid is adopted to select beams in the interference field and accordingly direct current components in the beams are reduced, the contrast ratio of interference fringes is improved, and the adjustable optimization of the contrast ratio is implemented. The micro spherical type short coherent point diffraction interference measurement system and method is applied to the micro spherical type detection.
Owner:HARBIN INST OF TECH

A double-buck full-bridge grid-connected inverter based on frequency multiplication modulation

The invention discloses a dual buck full-bridge grid-connected inverter based on frequency multiplication modulation, the dual buck full-bridge grid-connected inverter comprises a power switch tube S5, wherein a drain of the power switch tube S5 is connected with a positive electrode of direct current voltage Udc, and a source of the S5 is respectively connected with the drain of a power switch tube S1, a negative electrode of a diode D2, the drain of a power switch tube S3 and the negative electrode of a diode D4. For the inverter provided by the invention, frequency multiplication modulationis used on the aspect of control, under the premise of constant switching frequency, working frequency is improved to double of the original frequency, thus, higher output voltage frequency can be obtained and grid-connected electrical energy quality is improved; isolation between an alternating current side and a direct current side is realized structurally, and direct current component of the grid-connected voltage is reduced; moreover, the switch tube is in a half-cycle working mode, thus, switch loss is reduced, continuing current circuit grid-connected current does not pass through a body diode which has relatively poor performance, so, the dual buck full-bridge grid-connected inverter has the advantages of low grid current total harmonic distortion and high reliability.
Owner:SOUTHWEST PETROLEUM UNIV

Synchronized phasor measurement method, system and related components

The application discloses a synchronized phasor measurement method, system and related components, including: collecting power signals, adding the absolute time scale output by the 5G clock to the power signals; obtaining the amplitude-frequency response curve of the power signal; determining the power signal according to the amplitude-frequency response curve The state of the power signal, the state includes an attenuated DC component, and / or contains an interharmonic component or a harmonic component, and / or contains an amplitude modulation signal and / or a phase angle modulation signal; the power signal is calculated by an algorithm corresponding to the state The fundamental phasor parameters of . This application uses 5G with superior communication performance such as short delay, high reliability, high-precision time synchronization, and extremely high bandwidth for data transmission and time synchronization, which can meet the requirements of the distribution network synchrophasor measurement device for transmission. The delay requirement saves the input of GPS and optical fiber and other communication inputs, thereby saving the cost of synchrophasor measurement devices, high measurement accuracy, and improving the application effect of advanced applications of wide-area measurement, control and protection of distribution networks.
Owner:ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1

Excitation power circuit of rotary transformer

The invention discloses an excitation power circuit of a rotary transformer, belongs to the field of drive power sources, and solves the problems of complex circuit and incapability of independently working in the traditional excitation power of the rotary transformer. The excitation power circuit consists of a sinusoidal oscillation circuit, an amplitude adjusting circuit and a power amplifying circuit, wherein the sinusoidal oscillation circuit consists of a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C1, a capacitor C2, a capacitor CSEL1, a capacitor CSEL2, a first operational amplifier and a second operational amplifier; the amplitude adjusting circuit consists of a resistor R6, a resistor R7, a resistor RSEL, a capacitor C3 and a third operational amplifier; and the power amplifying circuit comprises a resistor R8 and a power amplifier. The frequency of a sinusoidal excitation power source generated by the circuit of the invention is modulated by selecting a capacitance value of the capacitor CSEL1 and the capacitor CSEL2, and the amplitude value of the sinusoidal excitation power source is adjusted by changing the resistance value of the resistor RSEL. The excitation power circuit of the invention serves as the drive power source of the rotary transformer.
Owner:HARBIN INST OF TECH

A Distributed Sensing System Based on Differential Amplification Technology

ActiveCN105203136BSolve the problem that the zoom position cannot be adjustedImprove accuracyConverting sensor output opticallyFiberData acquisition
The invention discloses a distributed optical fiber sensing system based on differential amplification technology. It consists of two parts: optical path detection and circuit demodulation; the optical path uses two microwave signals of different frequencies to modulate onto the signal light: the frequency of one microwave signal is within the Brillouin frequency shift frequency, and the frequency of the other microwave signal is higher than that of the Brillouin frequency shift. The deep frequency shift frequency is slightly lower; on the circuit, a power divider is used to separate the two signals, filter and demodulate them separately, and then perform differential amplification to amplify the demodulated signal. The differential amplification structure is used to amplify the signal collected by the data acquisition card in a specific amplitude range, which solves the problem that the upper computer data acquisition card range is limited in the distributed Brillouin time domain analysis sensor system, and the DC component is large. Time cannot meet the accuracy of data collection, which leads to the problem that the accuracy of system measurement is reduced. The device of the invention works stably, and can accurately measure the temperature (or stress) change position and temperature value (or stress value) in multiple measurements.
Owner:SOUTHWEST JIAOTONG UNIV

Built-in hybrid excitation bilateral magnetic channel linear motor

The invention discloses a built-in hybrid excitation bilateral magnetic channel linear motor, and relates to the technical field of linear motors. The linear motor comprises bilateral secondary stators and a primary mover arranged between the stators. The primary mover comprises six primary mover units, and magnetic barriers exist between the primary mover units. Each mover unit comprises two H-shaped magnetic conductive iron cores, and built-in permanent magnets are arranged at the bridge arm positions of the H-shaped magnetic conductive iron cores. Two groups of armature winding mounting grooves and one group of excitation winding mounting grooves are respectively formed in the two ends of the primary mover unit. Each secondary stator comprises a stator yoke and secondary teeth. The bilateral secondary stators are fixed parts, the primary mover is a moving part, and the primary mover performs linear motion in the middle of the bilateral secondary stators, so that the linear motion motor with a bilateral flat plate structure is formed. The linear motor has the advantages of being low in manufacturing cost, symmetrical in flux linkage structure, small in direct current component, small in harmonic component, large in thrust density and the like.
Owner:SHIJIAZHUANG TIEDAO UNIV

Measuring method of power transmission line failure distance

ActiveCN1793995BUnaffected by frequency fluctuationsReduce DC componentFault locationCable fault locationEngineering
A method for measuring fault distance of power transmission line measures A phase voltage Uma, current Ima, load current Ifa, zero sequence fault component ImaO, unit positive sequence, zero sequence induction and resistance at M side of fault point then substitutes above values into formula of KL = ( LO - L1 ) L1 and formula of KR = ( RO - R1 ) R 1 for calculating out result.
Owner:保定浪拜迪电气股份有限公司

A carbon monoxide concentration detection device and detection method

The invention discloses a detection device and a detection method for carbon monoxide concentration. In the detection device, a first beam splitter splits a light beam emitted by a light source into acalibration light beam and a detection light beam; the calibration light beam is irradiated to a photoelectric detector after passing through a collimator and a calibrated absorption cell to obtain acalibrated electrical signal; a second beam splitter splits the detection light beam into a reference light beam and a measurement light beam; the reference light beam is irradiated to the photoelectric detector after passing through the collimator to obtain a reference electrical signal; the measurement light beam is emitted from the center of a Fresnel lens after passing through the collimatorand is irradiated to a reflecting end after passing through a to-be-detected area, and the reflecting end reflects the light beam to the photoelectric detector from an original path to obtain a measurement electrical signal; a differential amplifier performs differential operation on the reference electrical signal and the measurement electrical signal to obtain a differential signal; a processordetermines the carbon monoxide concentration in the to-be-detected area according to the calibration electrical signal, the reference electrical signal and the differential signal. The detection device and the detection method disclosed by the invention can improve the detection accuracy of laser spectrum measurement of the carbon monoxide concentration in an open area.
Owner:HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI

Signal processing method and system for underwater communication and electronic equipment

The invention discloses a signal processing method and system for underwater communication and electronic equipment, and the method comprises the steps: enabling a first terminal to receive to-be-transmitted data, carrying out the format conversion of the to-be-transmitted data, and obtaining converted data; after frame synchronization processing is carried out on the converted data, carrying out the Manchester coding on the processed data, and obtaining and sending coded data to the second terminal; after the second terminal receives the coded data, performing Manchester decoding on the coded data and performing frame synchronization search on the decoded data to obtain converted data; and performing format inverse conversion on the converted data to obtain data to be transmitted. According to the invention, the error-tolerant rate of the system is improved through error correction coding and decoding and addition of the synchronization sequence; the system is pre-equalized through 8B / 10B and Manchester coding and decoding, the direct current component of the system is reduced, the stability of the system is improved, and the error-tolerant rate is also remarkably improved.
Owner:武汉船舶通信研究所

Direct current component control method and system used for three-phase or single-phase inverter

The invention provides a direct current component control method and system used for a three-phase or single-phase inverter, wherein the method used for the three-phase inverter comprises the following steps: detecting the output voltage and direct-current component of the three-phase inverter; carrying out conversion from static coordinates to rotational coordinates on the direct current component so as to obtain a component of the direct current component on the rotational coordinates; calculating a direct voltage adjusted value according to the component of the direct current component on the rotational coordinates and a direct current voltage given value, and calculating the voltage given value according to the direct voltage adjusted value and a reference output voltage; calculating the output regulation voltage of the three-phase inverter according to the voltage given value and the output voltage of the three-phase inverter, and carrying out conversion from the rotational coordinates to the static coordinates on the output regulation voltage of the of the three-phase inverter and carrying out PWM (pulse-width modulation) so as to obtain driving signals of the three-phase inverter; and carrying out driving control on the three-phase inverter according to the driving signals. The method and system provided by the invention can be used for effectively reducing the direct-current component in the output voltage of the inverter so as to adapt to load requirements.
Owner:BYD CO LTD
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